title: Hybrid photonic-plasmonic crystal nanocavities.
abstract: We propose a hybrid optical nanocavity consisting of photonic crystals coupled to a metal surface with a nanoscale air gap between. The hybridization of photonic crystal modes and surface plasmons across the gap forms hybrid cavity modes, which are highly confined in the low-loss air gap region. Deep subwavelength mode volume and high quality factor are demonstrated at telecommunication wavelength, resulting in an extremely large Q/V(m) ratio of 60,000 λ(-3). This new type of high-Q/V(m) broad-band hybrid nanocavity opens up opportunities for various applications in enhanced light-matter interactions.
authors.affiliation: Materials Sciences Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720, USA.
authors.forename: Xiaodong
authors.initials: X
authors.lastname: Yang
authors.forename: Atsushi
authors.initials: A
authors.lastname: Ishikawa
authors.forename: Xiaobo
authors.initials: X
authors.lastname: Yin
authors.forename: Xiang
authors.initials: X
authors.lastname: Zhang